Gas lamp.



J. o G. KEITH.

GAS LAMP.

APPLIOATION FILED JULY 2'7, 190s.

Patented Apr. 13, 1909.

3 SHEETS-SHEET l.

M w fw @n i J. & G. KEITH. GAS LAMP. APPLICATION FILED JULY 27, 190s.

917,876. Patented Apr. 13, 1909. 3 SHEETS-SHEET 2- F .2. /f/ g HHHHH f 7 f] u n L yz'f .Zzzvza 7151'. @jp/@Wd 277266 Jaffa@ 6 Qc-Oye/z J. a G. KEITH.

GAS LAMP. APPLICATION FILED JULY 27, 1908.

Patented Apr. 13, 1909. 3 SHEETS-SHEET 3.

i vvJAMES KEITH AND GEORGE KEITH, OF LONDON, ENGLAND.

GAS-LAMP.

l Specicaton of Letters Patent.

Patented .epm 13, 190e.

Application led July 27, 1908. SerialNo. 445,648.

. To all wiom 'it may concern:

Be it known that we, JAMES KEITH and GEORGE KEITH, subjects of the King of the United Kingdom of Great Britain and Ireland, and residing at London, England, have inventedv a certain new and useful Im rovement in Gas-Lamps, of which the fol owing is a speciiicat-ion. l

This invention relates to improvements in gas lampsand more particularly to those used for high pressure gas lighting with inverted burners and it has for. its primary object to provide a lamp having an improved form of heater in which the 'mixture of gas and air is heated as highly as desirable, and in conjunction with which is employed a heavy metallic nozzle connected to the heater which serves to convey away as much heat as possible from the tip and transfer it to the heater. i

Further features of the invention appear from the following description.

In the accompanying drawings Figure 1r is a vertical section showing a lainp embodying the invention and 'adapted more es )ecially for outside-use. Fig. la'is a art pl of the inner and outer casings of' t 1e lamp, the' top of the inner casing being removed. Fig. lb is a detail view showing the upper art of the burner so arranged that the 'injector nipple may bewithdrawn from the top-without the lamp being taken a art. Fig. 1c is a part elevation part vertica section' showing alternative means for supporting the 'lamp globe or globes. Fig. 2 is a .vertical section' showing a modified construction oi lamp. Fig. 3 isa vertical section showing a slightly modified 'form oi' heater and nozzle. Figs. 4 and 4f* and Figs. 4b' and 4c show modifications thereof. Figs. 5, 6, 7 and l8 show details hereinafter referred to.

Referring firstly to Fig. l., the heater A is made substantially inthe forni of a hollow disk or'double cone with a diaphragm A between, said ,diaphragm being perforated at its edges at a. The heater is preferably made of aluminum, nickel-or other suitable metal', Which does not readily oXidize with heat, or is plated with some such metal. In this heater the mixture of gas and air is heated as highly as possible. To the said heater A is directly connected a heavy metallic nozzle B of good conducting ma- The provision' of a heavyv nozzle, it may be mentioned,.is not in itself new but l.

lhas been described in the specification of' British Letters Patent No. 17584 of 1904. This nozzle is fitted with a removable gauze disk B between the tip and lower portion of the heater A, as hereinafter more fully descrewed on to the nozzle' to prevent the passage of flame between the two and thus prevent the/'extreme ti of the -nozzle B from ecoming too hot or' t ie nozzle itself may be formed with a comparatively heavy metallic lining provided on the outside with a closefittin non-conductor to which any form of mant e or mantle ring can be attached in the usual way.

Special attention is called tothe im ortance" of using a heavy nozzle protected y a non-conductor in conjunction with the gas and air heater; it will be seen that the nozzle serves to convey heat to the heater, thus increasing the eiciency of the heater, while the heater on account of its large Varea coming into intimate contact with the incoming mixture serves to take away a large amount of heat from the nozzle. j j

The body of the lamp consists of a cylindrical outer casing D in which is fitted a box D having two or more fiat or concave sides d not in contact with the cylinder" D and provided with a closed bottom d", said box D having lateral openings d2`direct to the outside at the parts which are in contact with the outer casing D. Said lop'eni s d2 form inlets for the primary air. 'lhe w ole structure is surmounted by a suitable cowl lor cap which in the modification shown in Fig. 2 is preferably enameled with vitreous Theater A. If the entire outer casing, is

enameled, a metallic ring G (Fig. 1c) ymay be slip ed loosely over the outside of the chamberIF and is fitted with a suitable number of screws g which roj ect through clearance holes in the cham er F to support the globes and the reflectors; it is thus unnecessary to tap holes in any of the enameled parts. 

